Introduction
A multiplexer is always paired with a demultiplexer. A demultiplexer (demux for short) is a device that is the inverse of a multiplexer. It is used to separate the multiplexed signal into its different signals.
Demultiplexers are also knows as “Data Distributors”. A Demultiplexer contains one data input, one or more data selection input and multiple output. A Demux works by connecting a single input to the output. They are like a rotary switch selection switch with multiple contact. At any time only one input is connected to any of the output. Demultiplexers are used to convert the multiplexed signals and carry them to their intended source. Just like a mux, demux are also unidirectional device.
Demultiplexers are very simple to construct. Only a few logic gates can be used to construct a demux. We are going to take a very close look at demultiplexers in the Experiment 10.
Time Sharing
A multiplexer can be used to transmit data from multiple sources however, a Mux can only transmit data from one source at a time. It is possible to transmit data at small pieces over a span of time.
The Mux is made to transmit from one channel for a small amount of time and then it moves on to the next channel and repeats the process until it returns back to the initial transmitting channel. This method of transmitting small amount of data from multiple sources over a span on time is called ” Time Sharing “. Each sources/channels are active for a small amount of time allowing simultaneous transmission of data from multiple sources. The concept of time sharing is dominant in the field of communication. By using time sharing, a single connection can be used to communicate between multiple transmitters and receivers
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